3d model of dry grass mirrors. Taken from photos from La Bastide de Fléchon.

corona 5.2
vray 4.2
max + obj

Dimensions:
1000x1000x50
600x600x50

polys / verts:
737416/563324 (one mirror)

maxfile ~ 70mb

Who works in V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.

For Corona render it is recommended to install a version not lower than 1.5 since the glossiness of the materials is adjusted taking into account PBR.